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[Qemu-devel] [PATCH v5 43/45] End of migration for postcopy


From: Dr. David Alan Gilbert (git)
Subject: [Qemu-devel] [PATCH v5 43/45] End of migration for postcopy
Date: Wed, 25 Feb 2015 16:52:06 +0000

From: "Dr. David Alan Gilbert" <address@hidden>

Tweak the end of migration cleanup; we don't want to close stuff down
at the end of the main stream, since the postcopy is still sending pages
on the other thread.

Signed-off-by: Dr. David Alan Gilbert <address@hidden>
---
 migration/migration.c | 25 ++++++++++++++++++++++++-
 trace-events          |  2 ++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/migration/migration.c b/migration/migration.c
index 97b86cc..a137444 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -199,12 +199,35 @@ static void process_incoming_migration_co(void *opaque)
 {
     QEMUFile *f = opaque;
     Error *local_err = NULL;
+    MigrationIncomingState *mis;
+    PostcopyState ps;
     int ret;
 
-    migration_incoming_state_new(f);
+    mis = migration_incoming_state_new(f);
 
     ret = qemu_loadvm_state(f);
 
+    ps = postcopy_state_get(mis);
+    trace_process_incoming_migration_co_end(ret, ps);
+    if (ps != POSTCOPY_INCOMING_NONE) {
+        if (ps == POSTCOPY_INCOMING_ADVISE) {
+            /*
+             * Where a migration had postcopy enabled (and thus went to advise)
+             * but managed to complete within the precopy period, we can use
+             * the normal exit.
+             */
+            postcopy_ram_incoming_cleanup(mis);
+        } else if (ret >= 0) {
+            /*
+             * Postcopy was started, cleanup should happen at the end of the
+             * postcopy thread.
+             */
+            trace_process_incoming_migration_co_postcopy_end_main();
+            return;
+        }
+        /* Else if something went wrong then just fall out of the normal exit 
*/
+    }
+
     qemu_fclose(f);
     free_xbzrle_decoded_buf();
     migration_incoming_state_destroy();
diff --git a/trace-events b/trace-events
index 869988b..cbf4f88 100644
--- a/trace-events
+++ b/trace-events
@@ -1434,6 +1434,8 @@ source_return_path_thread_loop_top(void) ""
 source_return_path_thread_pong(uint32_t val) "%x"
 source_return_path_thread_shut(uint32_t val) "%x"
 migrate_transferred(uint64_t tranferred, uint64_t time_spent, double 
bandwidth, uint64_t size) "transferred %" PRIu64 " time_spent %" PRIu64 " 
bandwidth %g max_size %" PRId64
+process_incoming_migration_co_end(int ret, int ps) "ret=%d postcopy-state=%d"
+process_incoming_migration_co_postcopy_end_main(void) ""
 
 # migration/rdma.c
 __qemu_rdma_add_block(int block, uint64_t addr, uint64_t offset, uint64_t len, 
uint64_t end, uint64_t bits, int chunks) "Added Block: %d, addr: %" PRIu64 ", 
offset: %" PRIu64 " length: %" PRIu64 " end: %" PRIu64 " bits %" PRIu64 " 
chunks %d"
-- 
2.1.0




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